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特許 権利維持 In cryptography, encryption is the process of encoding messages or information in such a way that only authorized parties can read it.[1] Encryption does not of itself prevent interception, but denies the message content to the interceptor.[2]:374 In an encryption scheme, the intended communication information or message, referred to as plaintext, is encrypted using an encryption algorithm, generating ciphertext that can only be read if decrypted.